Ignition coil



Oct. 20, 1931. H, L. HARTZELL IGNITION COIL Filed May 23, 1930 PatentedOct. 20, 1931 UNITED STATES PATENT OFFICE HERMAN L. HARTZELL, OFANDERSON, INDIANA, ASSIGNOR TO DELCO-REMY CORPORA- TION, OF ANDERSON,INDIANA, A CORPORATION- OF DELAWARE IGNITION COIL Application filed May23,

This invention relates to improvements in ignition coils.

It is among the objects of the present invention to provide an ignitioncoil of simple structure and design, capable of being producedcommercially at a minimum cost.

Another object of the present invention is to secure the cover cap tothe casing of the ignition coil in a simplified manner.

Further objects and advantages of the present invention will be apparentfrom the following description, reference being had to the accompanyingdrawings, wherein a preferred embodiment of one form of the presentinvention is clearly shown.

In the drawings: 3

Fig. 1 illustrates the ignition coil in sid elevation.

Fig. 2 is a plan view of the ignition coil.

Fig. 3 is a fragmentary sectional view taken along the line 3-3 of Fig.2.

Fig. 4 is an inverted plan view of the cover cap with a section of thecasing or can attached.

Fig. 5 is a sectional view taken along the line 55 of Fig. 4. Y

Referring to the drawings, the ignition C011 comprises a can orcylindrical casing 20, having a bottom 21. Within this can are containedthe elements of the ignition coil which comprise a core 22 surrounded bythe secondary winding 23. The primar winding 24 surrounds the secondarywin ing 23 and about the primary winding there is provided a magneticbody 25 which fits tightly into the can or casing 20. Two lead wires 26and 27 are connected with the primary winding 24.

A cover cap 28 is provided for the can 20, said cover cap being made ofsuitable insulating material, such as bakelite. Thls cover cap has aninterior, central cylindrical extension 29 into which one end of thecore 22 fits and is supported thereby. A central, tubular extension 30has the terminal 31 therein, said terminal being in electricalconnection with the core 22 through the spike 32, the head ofwhichengages the terminal 31, said s ike being driven between thelamination orming the core 22. One end of the high tension or secondarywinding 23 is con- 1930. Serial No. 455,084.

nected with the core 22 in any suitable manner.

The cover cap 28 has a cylindrical portion 33 substantiallyconcentric'with portion 29 and which fits into the casing or can 20,said cylindrical portion 33 having an annular groove 34 formed therein.An annular flange 35 is provided on the cover cap, said annular flangehaving a recess 36 provided therein, one side wall of said recess beingsubstantially flush with the outer surface of the cylindrical portion 33of the cover cap 28. When the cover cap 28 is placed upon the can 20,the end of the can extends into the annular recess 36. After the covercap and can are so assembled, the annular portion of the can '20,designated by the numeral 40, is pressed into the annular groove 34, asshown particularly in Fig. 5, whereby the cover cap and can are securelyfastened together.

The cover cap has two diametrically opposed lug portions 41 and 42,forming increased areas in the cover cap. Within the lug portion 41there is provided a terminal stud 43, while a similar terminal stud 44is provided in the lug portion 42. The wire 26 leading from one side ofthe primary winding 24 is in electrical engagement with the terminalstud 43, and the wire 27 of the other end of the primary winding 24 isin electrical connection with the terminal stud 44. Diametricallyopposite radial ribs 45 and 46 are provided in the cover cap 28 betweenthe central cylindrical portion 29 and the outer cylindrical portion 33thereof, said annular ribs 45 together with the lugs 41 and 42 providingreinforcing members in the cover cap 28 which substantially preventcrushing of said cover cap when the pressing force is applied to forcethe annular portion 40 of the casing or can 20 into the annular groove34.

Terminal stud 43 has a terminal clip 50 secured thereto by nut 51, whilea similar clip 52 is secured to terminal stud 34 by the nut 53.

From the aforegoing it will be seen that applicant has provided anignition coil in which the cover cap is attached to the casing in asimplified and inexpensive manner, the method of attaching these twoelements com prising a joint which hermetically seals the ignition coil.

lVhile the form of embodiment of the present invention as hereindisclosed, constitutes a preferred form, it is to be understood thatother forms might be adopted, all coming within the scope of the claimswhich follow.

hat is claimed is as follows:

1. In a device of the character described, the combination with aninsulating body having a cylindrical portion provided with an annulargroove in its outer surface; an annular flange on said body providedwith an annular recess; and a cylindrical metal case fitting about thecylindrical portion of the insulating body and into the recess in itsflange, an annular portion of said case being pressed int-o said annulargroove to secure the insulating body to the case.

2. In an ignition coil the combination with a metallic casing containingthe primary and secondary windings of the ignition coil; of aninsulating body having an annular flange provided with an annular recessfor receiving the end of the casing; a cylindrical portion fitting intosaid casing, said portion having an annular groove into which an annularportion of the case is pressed to secure the insulating body and casingtogether; two

diametrically oppositelugs in the insulating body; a terminal in eachlug for receiving the ends of the primary winding respectively; radialribs in the insulating body, said lugs and ribs reinforcing theinsulating body to withstand the pressure for forcing the casing intothe annular groove of said body.

In testimony whereof I hereto aifix my signature.

HERMAN L. HARTZELL.

